Emanuel Araújo Silva

Uso de imagens orbitais no geoprocessamento algébrico da microrregião da Campanha Ocidental, Rio Grande do Sul

To analyze the temporal transformation of land cover and use in the microregion of Campanha Ocidental, Rio Grande do Sul state, a mosaic of LANDSAT 5 satellite images (Thematic Mapper sensor) covering the study region was used for the periods of 1985, 1996 and 2011. These images were processed and analyzed in SPRING 5.2.1 application, and the intersection of thematic maps was conducted with the aid of LEGAL (Spatial Language for Algebraic Geoprocessing) program. Agricultural and native areas were the classes that most influenced the changes in Land Use.

Uso de Imagens Orbitais no Geoprocessamento Algébrico da Microrregião da Campanha Ocidental, Rio Grande do Sul / Use of Satellite Images in Algebraic Geoprocessing in the Microregion of Campanha Ocidental, Rio Grande do Sul state, Brazil

To analyze the temporal transformation of land cover and use in the microregion of Campanha Ocidental, Rio Grande do Sul state, a mosaic of LANDSAT 5 satellite images (Thematic Mapper sensor) covering the study region was used for the periods of 1985, 1996 and 2011. These images were processed and analyzed in SPRING 5.2.1 application, and the intersection of thematic maps was conducted with the aid of LEGAL (Spatial Language for Algebraic Geoprocessing) program. Agricultural and native areas were the classes that most influenced the changes in Land Use.

Distinção de espécies de eucaliptode diferentes idades por meio de imagens TM/Landsat 5

The objective of this work was to evaluate the use of the TM/Landsat 5 sensor imagens in the differentiation of commercial plantations of Eucalyptus urograndis and Eucalyptus dunnii of different ages. Plots were marked for identification of the two Eucalyptus species, in two different periods (2009 and 2011): for 3- and 5-year-old E. dunnii, and for 2.2- and 4.2-year-old E. urograndis. Evaluations were done for six bands of the TM/Landsat 5 sensor (B1, B2, B3, B4, B5, and B7), and for six vegetation indices - simple ratio (SR); and normalized difference vegetation index (NDVI); soil-adjusted vegetation index (Savi)-0.25; Savi-0.5; green NDVI (GNDVI); and the moisture-vegetation index (MVI). Image digital processing consisted of geometric, radiometric, and atmospheric corrections. The plantations of E. dunnii and E. urograndis were distinguished by five bands of Landsat (B2, B3, B4, B5, and B7) and three vegetation indices (Savi-0.5, Savi-0.25, and GNDVI), in 2009, and by four bands of Landsat (B2, B4, B5, and B7) and six vegetation indices (NDVI, SR, Savi-0.5, Savi-0.25, MVI, and GNDVI) in 2011. The spectral data extracted from TM/Landsat 5 images are effective, both to distinguish the species of eucalyptus as well as the same species in even-aged stand.

Temporal and spatial dynamics of the soil usage in the micro-region of Campanha Central do Rio Grande do Sul between the years of 1992 and 2010

This article aims to present the temporal evolution occurred on soil use in 1992 and 2010 in the microregion Central Campaign of Rio Grande do Sul, giving prominence to forests transition. The images from the Landsat TM sensor platform 5 and the Spring application, was classified images, determining the following land use classes: bare soil, water, agricultural use, sand, native forest and plantation forests. For the generation of thematic maps was used to LEGAL Analysis (GIS Spatial Algebraic Language), tool that enables spatial analysis using map algebra. From the generation of thematic maps were calculated areas where there was the expansion of native forests (7.55% of total area) areas where natural regeneration has occurred, becoming forest in 2010. The area that has remained the use of native forest over 18 years is 2.83% of the total area. Deforestation, forest areas belonging to native and has reverted to another use, is 1.23%. Reforestation, represented by the areas that now belong to the class planted forest was quantified at 0.57% of the total area of microregion. The remaining land use change (86.98% of total area) were among the other classes of land use. The work allowed us to observe the changes in land use over a period of 18 years, it was observed an increase in forest area, both native and planted. This increase is probably related to the investment in the forest sector in the region since 2005, accompanied by the abandonment of land unwieldy and increase the rigor of the law.